<?php

/**

 * Created by JetBrains PhpStorm.

 * User: taoqili

 * Date: 12-7-18

 * Time: 上午11: 32

 * UEditor编辑器通用上传类

 */

class Uploader

{

    private $fileField;            //文件域名

    private $file;                 //文件上传对象

    private $config;               //配置信息

    private $oriName;              //原始文件名

    private $fileName;             //新文件名

    private $fullName;             //完整文件名,即从当前配置目录开始的URL

    private $fileSize;             //文件大小

    private $fileType;             //文件类型

    private $stateInfo;            //上传状态信息,

    private $stateMap = array(    //上传状态映射表，国际化用户需考虑此处数据的国际化

        "SUCCESS" ,                //上传成功标记，在UEditor中内不可改变，否则flash判断会出错

        "文件大小超出 upload_max_filesize 限制" ,

        "文件大小超出 MAX_FILE_SIZE 限制" ,

        "文件未被完整上传" ,

        "没有文件被上传" ,

        "上传文件为空" ,

        "POST" => "文件大小超出 post_max_size 限制" ,

        "SIZE" => "文件大小超出网站限制" ,

        "TYPE" => "不允许的文件类型" ,

        "DIR" => "目录创建失败" ,

        "IO" => "输入输出错误" ,

        "UNKNOWN" => "未知错误" ,

        "MOVE" => "文件保存时出错"

    );



    /**

     * 构造函数

     * @param string $fileField 表单名称

     * @param array $config  配置项

     * @param bool $base64  是否解析base64编码，可省略。若开启，则$fileField代表的是base64编码的字符串表单名

     */

    public function __construct( $fileField , $config , $base64 = false )

    {

        $this->fileField = $fileField;

        $this->config = $config;

        $this->stateInfo = $this->stateMap[ 0 ];

        $this->upFile( $base64 );

    }



    /**

     * 上传文件的主处理方法

     * @param $base64

     * @return mixed

     */

    private function upFile( $base64 )

    {

        //处理base64上传

        if ( "base64" == $base64 ) {

            $content = $_POST[ $this->fileField ];

            $this->base64ToImage( $content );

            return;

        }



        //处理普通上传

        $file = $this->file = $_FILES[ $this->fileField ];

        if ( !$file ) {

            $this->stateInfo = $this->getStateInfo( 'POST' );

            return;

        }

        if ( $this->file[ 'error' ] ) {

            $this->stateInfo = $this->getStateInfo( $file[ 'error' ] );

            return;

        }

        if ( !is_uploaded_file( $file[ 'tmp_name' ] ) ) {

            $this->stateInfo = $this->getStateInfo( "UNKNOWN" );

            return;

        }



        $this->oriName = $file[ 'name' ];

        $this->fileSize = $file[ 'size' ];

        $this->fileType = $this->getFileExt();



        if ( !$this->checkSize() ) {

            $this->stateInfo = $this->getStateInfo( "SIZE" );

            return;

        }

        if ( !$this->checkType() ) {

            $this->stateInfo = $this->getStateInfo( "TYPE" );

            return;

        }

        $this->fullName = $this->getFolder() . '/' . $this->getName();

        if ( $this->stateInfo == $this->stateMap[ 0 ] ) {

            if ( !move_uploaded_file( $file[ "tmp_name" ] , $this->fullName ) ) {

                $this->stateInfo = $this->getStateInfo( "MOVE" );

            }

        }

    }



    /**

     * 处理base64编码的图片上传

     * @param $base64Data

     * @return mixed

     */

    private function base64ToImage( $base64Data )

    {

        $img = base64_decode( $base64Data );

        $this->fileName = time() . rand( 1 , 10000 ) . ".png";

        $this->fullName = $this->getFolder() . '/' . $this->fileName;

        if ( !file_put_contents( $this->fullName , $img ) ) {

            $this->stateInfo = $this->getStateInfo( "IO" );

            return;

        }

        $this->oriName = "";

        $this->fileSize = strlen( $img );

        $this->fileType = ".png";

    }



    /**

     * 获取当前上传成功文件的各项信息

     * @return array

     */

    public function getFileInfo()

    {

        return array(

            "originalName" => $this->oriName ,

            "name" => $this->fileName ,

            "url" => $this->fullName ,

            "size" => $this->fileSize ,

            "type" => $this->fileType ,

            "state" => $this->stateInfo

        );

    }



    /**

     * 上传错误检查

     * @param $errCode

     * @return string

     */

    private function getStateInfo( $errCode )

    {

        return !$this->stateMap[ $errCode ] ? $this->stateMap[ "UNKNOWN" ] : $this->stateMap[ $errCode ];

    }



    /**

     * 重命名文件

     * @return string

     */

    private function getName()

    {

        return $this->fileName = time() . rand( 1 , 10000 ) . $this->getFileExt();

    }



    /**

     * 文件类型检测

     * @return bool

     */

    private function checkType()

    {

        return in_array( $this->getFileExt() , $this->config[ "allowFiles" ] );

    }



    /**

     * 文件大小检测

     * @return bool

     */

    private function  checkSize()

    {

        return $this->fileSize <= ( $this->config[ "maxSize" ] * 1024 );

    }



    /**

     * 获取文件扩展名

     * @return string

     */

    private function getFileExt()

    {

        return strtolower( strrchr( $this->file[ "name" ] , '.' ) );

    }



    /**

     * 按照日期自动创建存储文件夹

     * @return string

     */

    private function getFolder()

    {

        $pathStr = $this->config[ "savePath" ];

        if ( strrchr( $pathStr , "/" ) != "/" ) {

            $pathStr .= "/";

        }

        $pathStr .= date( "Ymd" );

        if ( !file_exists( $pathStr ) ) {

            if ( !mkdir( $pathStr , 0777 , true ) ) {

                return false;

            }

        }

        return $pathStr;

    }

}